Local Structure about Defect Atoms in Crystals

缺陷原子局域结构的研究 几种轻掺杂材料，重点是 继续研究偏心系统和偏心条件， 中心行为 顺电-顺弹性隧穿中心 代表了解低温的理想测试系统 隧道行为 顺电共振，介电常数 扩展X射线吸收精细结构 （EXAFS）将对KCL等系统进行研究， 取代的Li离子、具有取代的F离子的NaBr和KI 作为流体静力学的函数， 压力 压力将偏离中心的缺陷移回中心 并导致与关断的条件有关的信息， 中心位移 也希望研究偏离中心 在高于溶解度极限的高得多的浓度下的缺陷 as a function函数of temperature温度. 希望这项工作能 与玻璃中的隧穿行为有关。

Investigations of the local structure about defect atoms in several lightly doped materials with the emphasis on the continued study of off-center systems and the conditions for off- center behavior. The paraelectric-paraelastic tunneling centers represent ideal test systems for understanding low temperature tunneling behavior. Paraelectric resonance, dielectric constant measurements, and Extended X-ray Absorption Fine Structure (EXAFS) studies will be made on systems such as KCL with substitutional Li ions, NaBr with substitutional F ions, and KI with substitutional Ag ions as a function of hydrostatic pressure. Pressure moves the off-center defects back on center and leads to information relating to the conditions for the off- center displacement. It is also hoped to study off-center defects at much higher concentrations above the solubility limits as a function of temperature. It is hoped this work will have some connection to tunneling behavior in glasses.